Income Taxes (Schedule of Components of Deferred Income Tax Expense/(Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Net effect of temporary differences	$ (334)	$ (7,557)	$ 1,593
Foreign tax credits	2,378	9,468	(5,668)
Postretirement benefits	1,482	(18,337)	5,119
Net impact to operating loss carryforwards	(6,897)	1,240	3,258
Enacted changes in tax laws and rates	(282)	(973)	115
Adjustments to beginning-of-the-year valuation allowance balance for changes in circumstances	(3,741)	(2,442)	22,798
Change in tax status			(3,344)
Deferred income tax provision	$ (7,394)	$ (18,601)	$ 23,871